Sash-fastener.



L. A. "BITTORR SASH FASTENER. APPLIOATION H050 MAB. 2a, 1907.'

Patented-oct. 0, 1908.

s s.; wAsHmcroN. o. c.

Louis BiTfroRF, or STERLING,` rILLINOIS. t

sAsHFAs'rENER. g

To all whom 'it may concern:` v

Be it known that I,;Louis A. BITTORF, a citizen of the United States, residing at Sterling, Whiteside county, Illinois,have invented certain vnew and useful Improvements in Sash-Fasteneraof which the following is a specification.

My lnventlon relates'to Asa'shgfasteners and the object thereof is to 'produce a device of this character which shall be `not onlyy eiiicient and reliable in operation, buty also simple and inexpensive. l. In myimproved sash-fastener I employ a single spring which coperateswith the controlling lever of the lsashgfastenerV and Yis so mounted and arranged las to rhold-suchlever showing the operating lever in itsfop'enor disengagedposltlon; andFig. 8 a sectlonon in either one of its two positions except `as againstpositive force of. the user, but which nevertheless `permits of the free movement or oscillation of the controlling lever from one of such positions tothe other. n t

In my improved sash fastenerI also pro# vide for the reduction of the friction of the moving partsto'the minimum.

In the accompanying drawing,-Figure l` 1s a perspective vlew of my sashffastener;

Fig. 2 a section onthe lline 2 2. of Fig.l 1; Fig. 3 a bottom plan view of the sashA fas- .tener properwith the operating lever shown in its open or disengaged position;fFig.-.4. a

section on the line 4 4: of Fig. 1'; Fig. 51a` l plan view of the baseplatealonegi Fig. 6 Aa f, perspective of the disk to whichthe operat-f` ing lever is secured; FTabottom plan view of a modiedform'of construction the line 8--8'of Fig. "7, Y l Referring to thel embodiment ofmy4 invention as illustrated in Figs/."1` Vto 6, the sash fastener proper comprisesla base-plate l of suitable size `and dimensions-andhaving a depending marginal flange la, thereby` formingtherewithin `a space or chamber in whichk some of the operating parts hereinafter de?v scribed are located. :This1bas`e1plate is also provided with holes `1"--whereby the'V same may be secured tothe y'rail of aswindowv sash, by screws inv the'usual mannergAs shown more particularly Fig., `5, the base, plate is provided witha central "circulan opening 1c of a suitable size lto ac co'mnlodato-` y i `Speci*.caftioii of Letters Patent. `Appiii-,anon inea Marchas, 1907. semina. 364,154.Y

`Patented oet. e, 1908.

thecentrally expanded portion 2a of a disk or plate 2, whose flat portion or margin is adapted to bear against the under side or face of the lbase plate. In practice and by preferencethis expanded portion 2a projects slightly through the opening lc of the base plate andentersa socket 3a which is provided on theunder side of the operating or loclng lever 3. This lever is firmly secured tothe disk 2 in suitable manner, as by means .of a rivet 4: or `the like, so that such parts move or oscillate in unison in the lockingand unlocking operation of the fastener.` Thisleverz is in other respects of 4the usual and well-'known `construction and therefore' providedv with the usual cam flange 3b which cooperates with the usual form of lkeeper'such `as that shown at 5 in Figs. l `and 2.

. For thepurpose of holding the operating or.locking'lever in either one of its two positions with a yielding pressure I employ a single coiled springt, one end of which is mountedstationarily at the point7 which in practicefis a tonguev struck up from Vthejbase plate" itself, andthe other end of which is secured in suitable mannerto the disk or plate 2 at a Vpoint nearthe periphery thereof. In

fthe present instance I, have shown such latterend of-thespring a'sattached to a pin 8 projecting downwardly from the lower face of thev disk or plate 2. As clearly indicated Vin Fig. 3, the two points'of the spring attachmentjare on two right angle lines, both `radial ofthe axis of rotation of the `disk 2 whensuch disk' is in either one of its two positions.V Itis now evident that when the jdiskis rotated in the direction indicated by the arrowin FigA 3 vthe spring is .distended until" its `axis` passes `beyond a line corresponding with a diameter, extending through the point of spring attachment 7 after which the` spring tends to assume its `normal condition and to exercise its stress upon the disk and operating lever. The movement ofthe disk andlever upto central position is there- Vfore vagainst thetension of the spring, after which Vthe spring tends to bring the vdisk `and levertofthe l,positionrto which itis being moved...y iThe` operation to bring thedisk and, lever toits initial position isjust the reverse 'ofthat described,lin which operation the spring will be moved from its dotted line position to the full line position shown in Fig. 3. Inasmuch as the tension of the spring increases gradually up to its central position and its full tension is not attained until such position is reached (instead of full tension operating on the controlling lever in all positions thereof), the movement of such lever is easy in operation and the latter is caused to move or snap into the position toward which it is being moved by the stress of the spring after its movable point of attachment has passed the center and when it is under its greatest tension. It will be understood that the operating lever is limited in its two movements in the usual way as by means of a projection 1d on the top face of the base plate.

In order to reduce the friction of the disk or plate 2 and in order to prevent sticking` of the parts after they have been lacquered, I provide such disk or plate with a series of radial grooves or corrugations 2b, whose crowns only bear against the under side or surface of the base plate, thereby reducing the amount of the bearing or friction surface, the remainder of the margin of the disk or plate being of course separated fromy the lower face of the base plate. In this manner the friction is reduced and the possibility of sticking, which is liable to occur inthe case of flat disks after being lacquered, is avoided.

The feature of my invention as regards the employment of the single spring eoperating with the locking lever may be embodied in other constructions of sash fastener, as illustrated in Figs. 7 and 8, wherein the disk or plate 2 is dispensed with and in which the spring is shown connected as to its movable or oscillating end directly with the locking lever instead of indirectly through the medium of the disk or plate 2 in the first described form of construction. In this modification the base plate 9 is the same as the base plate l with the exception of the provision of the semi-circular slot 9, in which travels a pin l0 depending from the lower side of the locking lever 11 and passing through such slot. This pin or proj ection from the lever constitutes a point of attachment for the movable or oscillating end of a spring l2 whose other end is se'- cured to a stationary point 13 corresponding to the point or tongue 7 of the usual form of construction. The operation of this modified form of construction is obviously the same as the other form, but it will be noted that the pin l0 also serves as a stop for the movement of the lever, inasmuch as such movement is limited by the contact of such pin at either end of the semi-circular slot with the result that the projection ld of the other form of construction may be here dispensed with if desired.

I claim:

l.. In a sash fastener, the combination of a base plate, an operating lever mounted to rotate thereon, and a coiled spring cooperating with the lever to hold it in either one of its two positions with a yielding pressure and arranged to be oscillated as to one end from one side to the other of the axis of rotation of such lever when the latter is op erated.

2. In a sash fastener, the combination of a base plate, an operating lever mounted to rotate thereon, and a coiled spring cooperating with the lever to hold it in either one of its two positions with a yielding pressure, fixed stationarily as to one end at a point on a line radial of the axis of rotation of the lever and connected at its other end with such lever at a point on a radial line substantially at right angles to the first named radial line.

8. In a sash fastener, the combination of a base plate, an operating lever mounted to oscillate on one side thereof, a disk arranged to oscillate on the other side and connected with the lever, and a coiled spring fixed as to one end and secured as to the other end to the disk.

4. In a sash fastener, the combination of a base plate, an operating lever mounted to oscillate on one side thereof, a disk arranged to oscillate on the other side and connected with the lever, said disk having a seriesof projections on its inner side to decrease the amount of bearing surface between it and the plate, and means for holding the lever in either one of its two positions.

5. In a sash fastener, the combination of a. base plate provided with a. socket portion withan opening therein, a disk having a socket portion positioned in said opening, an operating lever secured to said disk, and a coiled spring connected at one end to the disk to hold the lever in either one of its two positions.

G. In a sash fastener, the combination of a. base plate provided with a. socket portion with an opening therein, a disk having a. socket portion positioned in said opening and projecting partially above the outer surface of the plate, an operating level' secured to said disk and having on its inner side a socket to receive said projecting portion of the disk, and means for holding the lever in either one of its two positions.

7. In a sash fastener, the combination of a base plate provided with a socket portion with an opening therein, a disk having a socket portion positioned in said opening, and a marginal portion provided with projections on its inner side to decrease the with an opening tlierein,a diskliaving a sooket portion positioned in said opening,an operating lever secured to said disk, `and a coiled springseciired at one end to the plate i and at the other end tothe disk, the points l0 ofattaehrnent of the spring being on right angledlines radial of the axis of oscillation of the lever.

" LoUIs A. BITToRr.

"`Witnesses: Y Y

' W. K. PALMER,

W. P. BENSON. 

